GOP Rep. Bilbray concedes his race

Rep. Brian Bilbray (R-Calif.) has conceded to Democrat Scott Peters in one of the nation's closest — and most expensive — House races.

Bilbray had trailed Peters by just a few hundred votes on election night, but that gap has now expanded to more than 3,700 votes. The San Diego-based district was a top target by both parties and saw a total of $7.3 million in independent expenditures pour in, making it one of the most expensive House races in the country.

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Peters's win means Democrats netted four seats in California, half their total gains in the House.

Peters, a San Diego port commissioner, has been in Washington, D.C., this week for new-member orientation.